Wyatt is excited for Halloween as he plans to come up with the scariest costume for a contest at his school's high school where the winner gets into the high school's Nightmare Society, who have pulled off epic scares every Halloween. However, the traditions of Halloween are wanting to be changed by Mrs. Phlerger, who is now head of the activist group P.O.O.P (Pauling Organization of Parents) turning the school into a Halloween-free zone. When Mrs. Phlerger plans to promote Health-O-Ween to the United States, Wyatt, Crash, Pesto, and Cleo receive help from the Nightmare Society to turn the tables on Mrs. Phlerger and get Halloween back to normal.